[Christ]

First, I should qualify this by saying that I haven't done it to any of my vehicles yet, so the result isn't predictable 100%.

You'll need a small heater core (that fits in your airbox, or that you can mod into it), enough hose to reach from your OE heater core lines to the airbox, two Tee fittings, and a heater control valve.

You'll install the heater core in the airbox, tee off the lines to your OE heater core, and install the flow valve on the input side. Run an old choke cable into the cabin from the flow valve, reinstall your airbox as normal, and burp the coolant system.

As the engine warms up, you'll have warm coolant flowing through the heater core. You effectively have a temperature controlled heater in your intake, which will give you the option to adjust for super-hot, super-cold, etc.

IN addition, you can adjust on the fly, while watching for instant economy and faults on your SGII.